A Sudden OCB Attack

The Tata Steel tournament keeps on producing games of very high quality. The following encounter demonstrated excellent defensive skills by both the players. At least until a moment when Black erred. Then Radjabov finished the game in a great attacking style in the endgame,
A game that I liked (ChessBase 13)

[Event "Tata Steel Masters"]
[Site "?"]
[Date "2015.01.18"]
[Round "8.7"]
[White "Radjabov, Teimour"]
[Black "Wojtaszek, Radoslaw"]
[Result "1-0"]
[WhiteElo "2734"]
[BlackElo "2744"]
[Annotator "Bojkov, Dejan"]
[PlyCount "117"]
[EventDate "2015.??.??"]
[WhiteClock "0:00:07"]
[BlackClock "0:03:23"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 {The main idea of
this line is to achieve an improved version of the Fianchettoe line with an
extra tempo for White (g2-g4 in one go instead of g2-g3 first).} e5 7. Nde2 b5
{Not the most common reaction for Black. But since Wojtaszek is one of the
leading specialist in the Najdorf this move is definitely worth a try!} ({Both
the developing moves} 7... Be7) (7... Be6) ({Or the restricting} 7... h5 {are
more popular than the text move.}) 8. Bg5 {Radjabov chooses a rare, but very
logical line in return. The d5 square is a magnet for the white pieces.} ({The
main move is} 8. g4 Bb7 9. Bg2 Nbd7 (9... h6 10. Be3 Nbd7 11. Qd2 {Mamedyarov,
S (2728)-Sadvakasov,D (2596) Astana 2006}) 10. a4 b4 11. Nd5 Nxd5 12. exd5 Qa5
{Inarkiev,E (2682)-Adly,A (2594) Dubai 2014}) 8... Nbd7 9. Nd5 {White is
willing to trade pretty much every single light piece except for the black
dark-squared bishop.} Bb7 10. Nec3 Rc8 {A cunning idea.} ({White is slightly
better after} 10... Be7 11. Bxf6 Nxf6 12. Nxf6+ Bxf6 13. a4 b4 14. Nd5 {when
both the positions with a knight versus a dark-squared bishop or pure opposite
colored bishops are favourable for him.}) 11. Nxf6+ ({Radek's idea becomes
clear in the line} 11. a4 b4 12. Bxf6 Nxf6 13. Nxf6+ Qxf6 14. Nd5 Qg6 $1 {
which looks awkward for the first player.}) 11... Nxf6 12. a4 $1 {It makes
sense to create some weaknesses before occupying the d5 square.} b4 13. Nd5 Be7
$1 {Black sacrifices a pawn. The alternatives are not appealing:} (13... Bxd5
$6 {leads to the above-mentioned opposite colored bishop position} 14. Bxf6
Qxf6 15. Qxd5 Rxc2 16. Qa8+ Qd8 17. Qxa6 Be7 18. Bb5+ Kf8 19. O-O {which White
would love to have.}) (13... a5 $2 {is simply bad due to} 14. Bb5+ Bc6 15. Bxf6
gxf6 16. O-O {with strategically won position for White- superior minor piece,
better pawn structure, bad king, etc...}) 14. Bxf6 Bxf6 15. Nxb4 {Radjabov
accepts the challenge.} ({The line} 15. b3 O-O 16. Bc4 a5 17. O-O Bg5 {leads
to equality.}) 15... O-O ({Naturally, not} 15... Bxe4 16. Bxa6 Rc5 17. Bb5+)
16. c3 $146 {Diagram [#] I need to bitterly disappoint you. All of this have
been previously played and the pawn sacrifice is not original. The strong move
in the game though is a novelty.} ({An important improvement. White reacted
poorly in the predecessing game} 16. Bd3 $6 Qb6 17. Qd2 a5 18. Na2 Qxb2 (18...
d5 $1 {was even better}) 19. O-O Qd4 20. Qxa5 Bxe4 {with advantage for Black
in Milovanovic,R (2399)-Sadvakasov,D (2605) Minneapolis 2005}) 16... Bxe4 17.
Bxa6 Rc5 {There is no time to digest the g pawn} (17... Bxg2 $2 18. Rg1 Bxh3
19. Qf3 $1 Be6 20. Bxc8 Bxc8 {normally would be a nice sacrifice of an
exchange if it was not the loose position of the black bishop on f6} 21. Nc6
Bb7 22. Rg3 $1 {the queen is now hanging and Black has to part with his bishop
pair} (22. Nxd8 $2 Bxf3) 22... Bxc6 23. Qxc6 {White is much better.}) 18. O-O
Ba8 {As a result of the opening battle White won a pawn but Black has distinct
compensation for it- a hefty bishop pair and central majority.} (18... Qa8 {
was another way to search for compensation} 19. Qg4 Be7) 19. Re1 {Now both the
players skillfully maneuver. Wojtaszek tries to advance his pawns in the
center and on the kingside while Radjabov carefully prevents this plan.} d5 20.
Bf1 ({Also interesting is} 20. Bb5 e4 21. Nc2 Be5 22. Nd4) 20... e4 21. Nc2 Be5
22. Nd4 Bb8 {One idea is to create a battery, another to advance the f pawn.}
23. g3 $1 ({Or else Black may advance the f pawn} 23. Qd2 f5 24. Ne6 $4 Qd6)
23... Qb6 24. Qe2 $1 {Diagram [#] Once more excellent profilaxys!} ({Teimour
should never allow the f7-f5 advance, as then f5-f4 will immediately follow
and the white position will fall appart on the dark squares.} 24. Qd2 f5) 24...
Rcc8 {The consequences of the direct assault are of a paramount importance for
the evaluation of the position. After the critical} (24... f5 {White has} 25.
Qa6 Qxb2 {and the fantastic resource} 26. Red1 $3 ({But not the tempting} 26.
Ne6 Bxg3 $1 27. fxg3 Rc6 28. Qb5 Qxb5 29. axb5 Rxe6) (26. Qxa8 Bxg3 27. Qxf8+
Kxf8 28. fxg3 Rxc3 {if anyone is better here, it is not White.}) 26... f4 {The
other tries do not work neither} (26... e3 27. Qe6+ Kh8 28. Qxe3 f4 29. Qe7) (
26... Qxc3 $2 27. Rac1 Qxc1 28. Rxc1 Rxc1 29. Qxa8) (26... Rxc3 27. Qxa8) 27.
Rab1 Qxc3 28. Rb3 Qa5 29. Ne6 {in all these lines White has the upper hand.})
25. a5 Qg6 26. Qg4 $1 Qh6 27. h4 $1 {[%cal Gg4g5] Very well played. Radjabov
will soon trade the queens.} Kh8 28. Qg5 Qd6 29. Nf5 Qe5 30. f4 $1 h6 31. Qxh6+
gxh6 32. fxe5 Bxe5 33. Be2 {As a result of his excellent strategy, Teimour
managed to trade the queens and took away one of Black's trumps- the possible
kingside attack. However, converting the advantage is far from easy.} Rb8 34.
Ra2 (34. Reb1 Bc6) 34... Kh7 35. Rd1 (35. a6 $1 {was more precise} Rg8 36. a7
Rb7 37. Kf2 {with excellent winning chances.}) 35... Rb3 ({Black couls also
sacrifice a second pawn} 35... d4 36. cxd4 Bd5 37. Raa1 Bf6) 36. Kf2 Rfb8 37.
Rd2 Kg6 $1 38. Ne7+ Kf6 39. Nxd5+ Bxd5 40. Rxd5 Rxb2 41. Rxb2 Rxb2 42. Ke3 {It
was Wojtaszek's turn to defend and he did it greatly as usual. The Polish GM
is one of the best defenders in the world.} (42. c4 Rb3 43. g4 Ra3 {is most
likely a draw.}) 42... Bxg3 (42... Bxc3 43. a6) 43. a6 {Diagram [#]} Bh2 $2 {
BBut this is wrong. Black could have drawn with} (43... Rc2 $1 44. Bb5 (44. Bc4
Rxc3+) 44... Rxc3+ 45. Kxe4 Ra3 {in this case the white bishop will not reach
the a2-f7 diagonal. All Black will need is to trade the rooks and sacrifice
the bishop for the a pawn.}) 44. Bc4 $1 {Suddenly, Radjabov creates an attack
which is usually unstoppable in the opposite colored bishop endgames!} Rc2 45.
Kxe4 Rxc3 46. Rf5+ Kg7 47. Rxf7+ Kg6 48. Bd5 Bg1 49. Rf1 Bc5 50. Ke5 Ra3 51.
Rf6+ Kh5 52. Rf4 Kg6 {The pawn is poisoned} (52... Rxa6 53. Bf7+ Rg6 54. Kf5
Be3 55. Bxg6#) 53. Rg4+ Kh7 (53... Kh5 $4 54. Kf5 {is instant mate.}) 54. Be4+
Kh8 55. Rg6 h5 56. Rc6 Bf8 57. Kf6 {Diagram [#] Total domination! The light
squares are undefendable.} Kg8 58. Bd5+ Kh7 59. Kf7 {A game with plenty of
content in which both the players skillfully defended when needed. Wojtaszek
committed only one mistake in the endgame and this was enough for Radjabov to
create deadly attack. Never underestimate the opposite colored bishops!} (59.
Kf7 Ra5 (59... Bb4 60. Be4+ Kh8 61. Rh6#) 60. Be4+ Kh8 61. Rc8 (61. Kxf8 Rxa6
$1 62. Rxa6)) 1-0


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